<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <style>
        .c1{
            width: 100px;
            height: 100px;
            border-radius: 50%;
            border:1px solid red;
            overflow: hidden;

        }

        div img{
            width: 100%;
            /*height: 100%;*/
        }

    </style>
</head>
<body>

<div class="c1">
    <img src="2.jpg" alt="">
</div>


</body>
</html>